lib/zlib_deflate/defutil.h - linux - Git at Google

 #ifndef DEFUTIL_H
 #define DEFUTIL_H

 #include <linux/zutil.h>

 #define Assert(err, str)
 #define Trace(dummy)
 #define Tracev(dummy)
 #define Tracecv(err, dummy)
 #define Tracevv(dummy)


 #define LENGTH_CODES 29
 /* number of length codes, not counting the special END_BLOCK code */

 #define LITERALS  256
 /* number of literal bytes 0..255 */

 #define L_CODES (LITERALS+1+LENGTH_CODES)
 /* number of Literal or Length codes, including the END_BLOCK code */

 #define D_CODES   30
 /* number of distance codes */

 #define BL_CODES  19
 /* number of codes used to transfer the bit lengths */

 #define HEAP_SIZE (2*L_CODES+1)
 /* maximum heap size */

 #define MAX_BITS 15
 /* All codes must not exceed MAX_BITS bits */

 #define INIT_STATE    42
 #define BUSY_STATE   113
 #define FINISH_STATE 666
 /* Stream status */


 /* Data structure describing a single value and its code string. */
 typedef struct ct_data_s {
     union {
         ush  freq;       /* frequency count */
         ush  code;       /* bit string */
     } fc;
     union {
         ush  dad;        /* father node in Huffman tree */
         ush  len;        /* length of bit string */
     } dl;
 } ct_data;

 #define Freq fc.freq
 #define Code fc.code
 #define Dad  dl.dad
 #define Len  dl.len

 typedef struct static_tree_desc_s  static_tree_desc;

 typedef struct tree_desc_s {
     ct_data *dyn_tree;           /* the dynamic tree */
     int     max_code;            /* largest code with non zero frequency */
     static_tree_desc *stat_desc; /* the corresponding static tree */
 } tree_desc;

 typedef ush Pos;
 typedef unsigned IPos;

 /* A Pos is an index in the character window. We use short instead of int to
  * save space in the various tables. IPos is used only for parameter passing.
  */

 typedef struct deflate_state {
     z_streamp strm;      /* pointer back to this zlib stream */
     int   status;        /* as the name implies */
     Byte *pending_buf;   /* output still pending */
     ulg   pending_buf_size; /* size of pending_buf */
     Byte *pending_out;   /* next pending byte to output to the stream */
     int   pending;       /* nb of bytes in the pending buffer */
     int   noheader;      /* suppress zlib header and adler32 */
     Byte  data_type;     /* UNKNOWN, BINARY or ASCII */
     Byte  method;        /* STORED (for zip only) or DEFLATED */
     int   last_flush;    /* value of flush param for previous deflate call */

                 /* used by deflate.c: */

     uInt  w_size;        /* LZ77 window size (32K by default) */
     uInt  w_bits;        /* log2(w_size)  (8..16) */
     uInt  w_mask;        /* w_size - 1 */

     Byte *window;
     /* Sliding window. Input bytes are read into the second half of the window,
      * and move to the first half later to keep a dictionary of at least wSize
      * bytes. With this organization, matches are limited to a distance of
      * wSize-MAX_MATCH bytes, but this ensures that IO is always
      * performed with a length multiple of the block size. Also, it limits
      * the window size to 64K, which is quite useful on MSDOS.
      * To do: use the user input buffer as sliding window.
      */

     ulg window_size;
     /* Actual size of window: 2*wSize, except when the user input buffer
      * is directly used as sliding window.
      */

     Pos *prev;
     /* Link to older string with same hash index. To limit the size of this
      * array to 64K, this link is maintained only for the last 32K strings.
      * An index in this array is thus a window index modulo 32K.
      */

     Pos *head; /* Heads of the hash chains or NIL. */

     uInt  ins_h;          /* hash index of string to be inserted */
     uInt  hash_size;      /* number of elements in hash table */
     uInt  hash_bits;      /* log2(hash_size) */
     uInt  hash_mask;      /* hash_size-1 */

     uInt  hash_shift;
     /* Number of bits by which ins_h must be shifted at each input
      * step. It must be such that after MIN_MATCH steps, the oldest
      * byte no longer takes part in the hash key, that is:
      *   hash_shift * MIN_MATCH >= hash_bits
      */

     long block_start;
     /* Window position at the beginning of the current output block. Gets
      * negative when the window is moved backwards.
      */

     uInt match_length;           /* length of best match */
     IPos prev_match;             /* previous match */
     int match_available;         /* set if previous match exists */
     uInt strstart;               /* start of string to insert */
     uInt match_start;            /* start of matching string */
     uInt lookahead;              /* number of valid bytes ahead in window */

     uInt prev_length;
     /* Length of the best match at previous step. Matches not greater than this
      * are discarded. This is used in the lazy match evaluation.
      */

     uInt max_chain_length;
     /* To speed up deflation, hash chains are never searched beyond this
      * length.  A higher limit improves compression ratio but degrades the
      * speed.
      */

     uInt max_lazy_match;
     /* Attempt to find a better match only when the current match is strictly
      * smaller than this value. This mechanism is used only for compression
      * levels >= 4.
      */
 #   define max_insert_length  max_lazy_match
     /* Insert new strings in the hash table only if the match length is not
      * greater than this length. This saves time but degrades compression.
      * max_insert_length is used only for compression levels <= 3.
      */

     int level;    /* compression level (1..9) */
     int strategy; /* favor or force Huffman coding*/

     uInt good_match;
     /* Use a faster search when the previous match is longer than this */

     int nice_match; /* Stop searching when current match exceeds this */

                 /* used by trees.c: */
     /* Didn't use ct_data typedef below to suppress compiler warning */
     struct ct_data_s dyn_ltree[HEAP_SIZE];   /* literal and length tree */
     struct ct_data_s dyn_dtree[2*D_CODES+1]; /* distance tree */
     struct ct_data_s bl_tree[2*BL_CODES+1];  /* Huffman tree for bit lengths */

     struct tree_desc_s l_desc;               /* desc. for literal tree */
     struct tree_desc_s d_desc;               /* desc. for distance tree */
     struct tree_desc_s bl_desc;              /* desc. for bit length tree */

     ush bl_count[MAX_BITS+1];
     /* number of codes at each bit length for an optimal tree */

     int heap[2*L_CODES+1];      /* heap used to build the Huffman trees */
     int heap_len;               /* number of elements in the heap */
     int heap_max;               /* element of largest frequency */
     /* The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used.
      * The same heap array is used to build all trees.
      */

     uch depth[2*L_CODES+1];
     /* Depth of each subtree used as tie breaker for trees of equal frequency
      */

     uch *l_buf;          /* buffer for literals or lengths */

     uInt  lit_bufsize;
     /* Size of match buffer for literals/lengths.  There are 4 reasons for
      * limiting lit_bufsize to 64K:
      *   - frequencies can be kept in 16 bit counters
      *   - if compression is not successful for the first block, all input
      *     data is still in the window so we can still emit a stored block even
      *     when input comes from standard input.  (This can also be done for
      *     all blocks if lit_bufsize is not greater than 32K.)
      *   - if compression is not successful for a file smaller than 64K, we can
      *     even emit a stored file instead of a stored block (saving 5 bytes).
      *     This is applicable only for zip (not gzip or zlib).
      *   - creating new Huffman trees less frequently may not provide fast
      *     adaptation to changes in the input data statistics. (Take for
      *     example a binary file with poorly compressible code followed by
      *     a highly compressible string table.) Smaller buffer sizes give
      *     fast adaptation but have of course the overhead of transmitting
      *     trees more frequently.
      *   - I can't count above 4
      */

     uInt last_lit;      /* running index in l_buf */

     ush *d_buf;
     /* Buffer for distances. To simplify the code, d_buf and l_buf have
      * the same number of elements. To use different lengths, an extra flag
      * array would be necessary.
      */

     ulg opt_len;        /* bit length of current block with optimal trees */
     ulg static_len;     /* bit length of current block with static trees */
     ulg compressed_len; /* total bit length of compressed file */
     uInt matches;       /* number of string matches in current block */
     int last_eob_len;   /* bit length of EOB code for last block */

 #ifdef DEBUG_ZLIB
     ulg bits_sent;      /* bit length of the compressed data */
 #endif

     ush bi_buf;
     /* Output buffer. bits are inserted starting at the bottom (least
      * significant bits).
      */
     int bi_valid;
     /* Number of valid bits in bi_buf.  All bits above the last valid bit
      * are always zero.
      */

 } deflate_state;

 #ifdef CONFIG_ZLIB_DFLTCC
 #define zlib_deflate_window_memsize(windowBits) \
 	(2 * (1 << (windowBits)) * sizeof(Byte) + PAGE_SIZE)
 #else
 #define zlib_deflate_window_memsize(windowBits) \
 	(2 * (1 << (windowBits)) * sizeof(Byte))
 #endif
 #define zlib_deflate_prev_memsize(windowBits) \
 	((1 << (windowBits)) * sizeof(Pos))
 #define zlib_deflate_head_memsize(memLevel) \
 	((1 << ((memLevel)+7)) * sizeof(Pos))
 #define zlib_deflate_overlay_memsize(memLevel) \
 	((1 << ((memLevel)+6)) * (sizeof(ush)+2))

 /* Output a byte on the stream.
  * IN assertion: there is enough room in pending_buf.
  */
 #define put_byte(s, c) {s->pending_buf[s->pending++] = (c);}


 #define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
 /* Minimum amount of lookahead, except at the end of the input file.
  * See deflate.c for comments about the MIN_MATCH+1.
  */

 #define MAX_DIST(s)  ((s)->w_size-MIN_LOOKAHEAD)
 /* In order to simplify the code, particularly on 16 bit machines, match
  * distances are limited to MAX_DIST instead of WSIZE.
  */

         /* in trees.c */
 void zlib_tr_init         (deflate_state *s);
 int  zlib_tr_tally        (deflate_state *s, unsigned dist, unsigned lc);
 ulg  zlib_tr_flush_block  (deflate_state *s, char *buf, ulg stored_len,
 			   int eof);
 void zlib_tr_align        (deflate_state *s);
 void zlib_tr_stored_block (deflate_state *s, char *buf, ulg stored_len,
 			   int eof);
 void zlib_tr_stored_type_only (deflate_state *);


 /* ===========================================================================
  * Output a short LSB first on the stream.
  * IN assertion: there is enough room in pendingBuf.
  */
 #define put_short(s, w) { \
     put_byte(s, (uch)((w) & 0xff)); \
     put_byte(s, (uch)((ush)(w) >> 8)); \
 }

 /* ===========================================================================
  * Reverse the first len bits of a code, using straightforward code (a faster
  * method would use a table)
  * IN assertion: 1 <= len <= 15
  */
 static inline unsigned  bi_reverse(
     unsigned code, /* the value to invert */
     int len        /* its bit length */
 )
 {
     register unsigned res = 0;
     do {
         res |= code & 1;
         code >>= 1, res <<= 1;
     } while (--len > 0);
     return res >> 1;
 }

 /* ===========================================================================
  * Flush the bit buffer, keeping at most 7 bits in it.
  */
 static inline void bi_flush(deflate_state *s)
 {
     if (s->bi_valid == 16) {
         put_short(s, s->bi_buf);
         s->bi_buf = 0;
         s->bi_valid = 0;
     } else if (s->bi_valid >= 8) {
         put_byte(s, (Byte)s->bi_buf);
         s->bi_buf >>= 8;
         s->bi_valid -= 8;
     }
 }

 /* ===========================================================================
  * Flush the bit buffer and align the output on a byte boundary
  */
 static inline void bi_windup(deflate_state *s)
 {
     if (s->bi_valid > 8) {
         put_short(s, s->bi_buf);
     } else if (s->bi_valid > 0) {
         put_byte(s, (Byte)s->bi_buf);
     }
     s->bi_buf = 0;
     s->bi_valid = 0;
 #ifdef DEBUG_ZLIB
     s->bits_sent = (s->bits_sent+7) & ~7;
 #endif
 }

 typedef enum {
     need_more,      /* block not completed, need more input or more output */
     block_done,     /* block flush performed */
     finish_started, /* finish started, need only more output at next deflate */
     finish_done     /* finish done, accept no more input or output */
 } block_state;

 #define Buf_size (8 * 2*sizeof(char))
 /* Number of bits used within bi_buf. (bi_buf might be implemented on
  * more than 16 bits on some systems.)
  */

 /* ===========================================================================
  * Send a value on a given number of bits.
  * IN assertion: length <= 16 and value fits in length bits.
  */
 #ifdef DEBUG_ZLIB
 static void send_bits      (deflate_state *s, int value, int length);

 static void send_bits(
     deflate_state *s,
     int value,  /* value to send */
     int length  /* number of bits */
 )
 {
     Tracevv((stderr," l %2d v %4x ", length, value));
     Assert(length > 0 && length <= 15, "invalid length");
     s->bits_sent += (ulg)length;

     /* If not enough room in bi_buf, use (valid) bits from bi_buf and
      * (16 - bi_valid) bits from value, leaving (width - (16-bi_valid))
      * unused bits in value.
      */
     if (s->bi_valid > (int)Buf_size - length) {
         s->bi_buf |= (value << s->bi_valid);
         put_short(s, s->bi_buf);
         s->bi_buf = (ush)value >> (Buf_size - s->bi_valid);
         s->bi_valid += length - Buf_size;
     } else {
         s->bi_buf |= value << s->bi_valid;
         s->bi_valid += length;
     }
 }
 #else /* !DEBUG_ZLIB */

 #define send_bits(s, value, length) \
 { int len = length;\
   if (s->bi_valid > (int)Buf_size - len) {\
     int val = value;\
     s->bi_buf |= (val << s->bi_valid);\
     put_short(s, s->bi_buf);\
     s->bi_buf = (ush)val >> (Buf_size - s->bi_valid);\
     s->bi_valid += len - Buf_size;\
   } else {\
     s->bi_buf |= (value) << s->bi_valid;\
     s->bi_valid += len;\
   }\
 }
 #endif /* DEBUG_ZLIB */

 static inline void zlib_tr_send_bits(
     deflate_state *s,
     int value,
     int length
 )
 {
     send_bits(s, value, length);
 }

 /* =========================================================================
  * Flush as much pending output as possible. All deflate() output goes
  * through this function so some applications may wish to modify it
  * to avoid allocating a large strm->next_out buffer and copying into it.
  * (See also read_buf()).
  */
 static inline void flush_pending(
 	z_streamp strm
 )
 {
     unsigned len;
     deflate_state *s = (deflate_state *) strm->state;

     bi_flush(s);
     len = s->pending;
     if (len > strm->avail_out) len = strm->avail_out;
     if (len == 0) return;

     if (strm->next_out != NULL) {
 	memcpy(strm->next_out, s->pending_out, len);
 	strm->next_out += len;
     }
     s->pending_out += len;
     strm->total_out += len;
     strm->avail_out  -= len;
     s->pending -= len;
     if (s->pending == 0) {
         s->pending_out = s->pending_buf;
     }
 }
 #endif /* DEFUTIL_H */
	#ifndef DEFUTIL_H
	#define DEFUTIL_H

	#include <linux/zutil.h>

	#define Assert(err, str)
	#define Trace(dummy)
	#define Tracev(dummy)
	#define Tracecv(err, dummy)
	#define Tracevv(dummy)



	#define LENGTH_CODES 29
	/* number of length codes, not counting the special END_BLOCK code */

	#define LITERALS 256
	/* number of literal bytes 0..255 */

	#define L_CODES (LITERALS+1+LENGTH_CODES)
	/* number of Literal or Length codes, including the END_BLOCK code */

	#define D_CODES 30
	/* number of distance codes */

	#define BL_CODES 19
	/* number of codes used to transfer the bit lengths */

	#define HEAP_SIZE (2*L_CODES+1)
	/* maximum heap size */

	#define MAX_BITS 15
	/* All codes must not exceed MAX_BITS bits */

	#define INIT_STATE 42
	#define BUSY_STATE 113
	#define FINISH_STATE 666
	/* Stream status */


	/* Data structure describing a single value and its code string. */
	typedef struct ct_data_s {
	union {
	ush freq; /* frequency count */
	ush code; /* bit string */
	} fc;
	union {
	ush dad; /* father node in Huffman tree */
	ush len; /* length of bit string */
	} dl;
	} ct_data;

	#define Freq fc.freq
	#define Code fc.code
	#define Dad dl.dad
	#define Len dl.len

	typedef struct static_tree_desc_s static_tree_desc;

	typedef struct tree_desc_s {
	ct_data dyn_tree; / the dynamic tree */
	int max_code; /* largest code with non zero frequency */
	static_tree_desc stat_desc; / the corresponding static tree */
	} tree_desc;

	typedef ush Pos;
	typedef unsigned IPos;

	/* A Pos is an index in the character window. We use short instead of int to
	* save space in the various tables. IPos is used only for parameter passing.
	*/

	typedef struct deflate_state {
	z_streamp strm; /* pointer back to this zlib stream */
	int status; /* as the name implies */
	Byte pending_buf; / output still pending */
	ulg pending_buf_size; /* size of pending_buf */
	Byte pending_out; / next pending byte to output to the stream */
	int pending; /* nb of bytes in the pending buffer */
	int noheader; /* suppress zlib header and adler32 */
	Byte data_type; /* UNKNOWN, BINARY or ASCII */
	Byte method; /* STORED (for zip only) or DEFLATED */
	int last_flush; /* value of flush param for previous deflate call */

	/* used by deflate.c: */

	uInt w_size; /* LZ77 window size (32K by default) */
	uInt w_bits; /* log2(w_size) (8..16) */
	uInt w_mask; /* w_size - 1 */

	Byte *window;
	/* Sliding window. Input bytes are read into the second half of the window,
	* and move to the first half later to keep a dictionary of at least wSize
	* bytes. With this organization, matches are limited to a distance of
	* wSize-MAX_MATCH bytes, but this ensures that IO is always
	* performed with a length multiple of the block size. Also, it limits
	* the window size to 64K, which is quite useful on MSDOS.
	* To do: use the user input buffer as sliding window.
	*/

	ulg window_size;
	/* Actual size of window: 2*wSize, except when the user input buffer
	* is directly used as sliding window.
	*/

	Pos *prev;
	/* Link to older string with same hash index. To limit the size of this
	* array to 64K, this link is maintained only for the last 32K strings.
	* An index in this array is thus a window index modulo 32K.
	*/

	Pos head; / Heads of the hash chains or NIL. */

	uInt ins_h; /* hash index of string to be inserted */
	uInt hash_size; /* number of elements in hash table */
	uInt hash_bits; /* log2(hash_size) */
	uInt hash_mask; /* hash_size-1 */

	uInt hash_shift;
	/* Number of bits by which ins_h must be shifted at each input
	* step. It must be such that after MIN_MATCH steps, the oldest
	* byte no longer takes part in the hash key, that is:
	* hash_shift * MIN_MATCH >= hash_bits
	*/

	long block_start;
	/* Window position at the beginning of the current output block. Gets
	* negative when the window is moved backwards.
	*/

	uInt match_length; /* length of best match */
	IPos prev_match; /* previous match */
	int match_available; /* set if previous match exists */
	uInt strstart; /* start of string to insert */
	uInt match_start; /* start of matching string */
	uInt lookahead; /* number of valid bytes ahead in window */

	uInt prev_length;
	/* Length of the best match at previous step. Matches not greater than this
	* are discarded. This is used in the lazy match evaluation.
	*/

	uInt max_chain_length;
	/* To speed up deflation, hash chains are never searched beyond this
	* length. A higher limit improves compression ratio but degrades the
	* speed.
	*/

	uInt max_lazy_match;
	/* Attempt to find a better match only when the current match is strictly
	* smaller than this value. This mechanism is used only for compression
	* levels >= 4.
	*/
	# define max_insert_length max_lazy_match
	/* Insert new strings in the hash table only if the match length is not
	* greater than this length. This saves time but degrades compression.
	* max_insert_length is used only for compression levels <= 3.
	*/

	int level; /* compression level (1..9) */
	int strategy; /* favor or force Huffman coding*/

	uInt good_match;
	/* Use a faster search when the previous match is longer than this */

	int nice_match; /* Stop searching when current match exceeds this */

	/* used by trees.c: */
	/* Didn't use ct_data typedef below to suppress compiler warning */
	struct ct_data_s dyn_ltree[HEAP_SIZE]; /* literal and length tree */
	struct ct_data_s dyn_dtree[2D_CODES+1]; / distance tree */
	struct ct_data_s bl_tree[2BL_CODES+1]; / Huffman tree for bit lengths */

	struct tree_desc_s l_desc; /* desc. for literal tree */
	struct tree_desc_s d_desc; /* desc. for distance tree */
	struct tree_desc_s bl_desc; /* desc. for bit length tree */

	ush bl_count[MAX_BITS+1];
	/* number of codes at each bit length for an optimal tree */

	int heap[2L_CODES+1]; / heap used to build the Huffman trees */
	int heap_len; /* number of elements in the heap */
	int heap_max; /* element of largest frequency */
	/* The sons of heap[n] are heap[2n] and heap[2n+1]. heap[0] is not used.
	* The same heap array is used to build all trees.
	*/

	uch depth[2*L_CODES+1];
	/* Depth of each subtree used as tie breaker for trees of equal frequency
	*/

	uch l_buf; / buffer for literals or lengths */

	uInt lit_bufsize;
	/* Size of match buffer for literals/lengths. There are 4 reasons for
	* limiting lit_bufsize to 64K:
	* - frequencies can be kept in 16 bit counters
	* - if compression is not successful for the first block, all input
	* data is still in the window so we can still emit a stored block even
	* when input comes from standard input. (This can also be done for
	* all blocks if lit_bufsize is not greater than 32K.)
	* - if compression is not successful for a file smaller than 64K, we can
	* even emit a stored file instead of a stored block (saving 5 bytes).
	* This is applicable only for zip (not gzip or zlib).
	* - creating new Huffman trees less frequently may not provide fast
	* adaptation to changes in the input data statistics. (Take for
	* example a binary file with poorly compressible code followed by
	* a highly compressible string table.) Smaller buffer sizes give
	* fast adaptation but have of course the overhead of transmitting
	* trees more frequently.
	* - I can't count above 4
	*/

	uInt last_lit; /* running index in l_buf */

	ush *d_buf;
	/* Buffer for distances. To simplify the code, d_buf and l_buf have
	* the same number of elements. To use different lengths, an extra flag
	* array would be necessary.
	*/

	ulg opt_len; /* bit length of current block with optimal trees */
	ulg static_len; /* bit length of current block with static trees */
	ulg compressed_len; /* total bit length of compressed file */
	uInt matches; /* number of string matches in current block */
	int last_eob_len; /* bit length of EOB code for last block */

	#ifdef DEBUG_ZLIB
	ulg bits_sent; /* bit length of the compressed data */
	#endif

	ush bi_buf;
	/* Output buffer. bits are inserted starting at the bottom (least
	* significant bits).
	*/
	int bi_valid;
	/* Number of valid bits in bi_buf. All bits above the last valid bit
	* are always zero.
	*/

	} deflate_state;

	#ifdef CONFIG_ZLIB_DFLTCC
	#define zlib_deflate_window_memsize(windowBits) \
	(2 * (1 << (windowBits)) * sizeof(Byte) + PAGE_SIZE)
	#else
	#define zlib_deflate_window_memsize(windowBits) \
	(2 * (1 << (windowBits)) * sizeof(Byte))
	#endif
	#define zlib_deflate_prev_memsize(windowBits) \
	((1 << (windowBits)) * sizeof(Pos))
	#define zlib_deflate_head_memsize(memLevel) \
	((1 << ((memLevel)+7)) * sizeof(Pos))
	#define zlib_deflate_overlay_memsize(memLevel) \
	((1 << ((memLevel)+6)) * (sizeof(ush)+2))

	/* Output a byte on the stream.
	* IN assertion: there is enough room in pending_buf.
	*/
	#define put_byte(s, c) {s->pending_buf[s->pending++] = (c);}


	#define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
	/* Minimum amount of lookahead, except at the end of the input file.
	* See deflate.c for comments about the MIN_MATCH+1.
	*/

	#define MAX_DIST(s) ((s)->w_size-MIN_LOOKAHEAD)
	/* In order to simplify the code, particularly on 16 bit machines, match
	* distances are limited to MAX_DIST instead of WSIZE.
	*/

	/* in trees.c */
	void zlib_tr_init (deflate_state *s);
	int zlib_tr_tally (deflate_state *s, unsigned dist, unsigned lc);
	ulg zlib_tr_flush_block (deflate_state s, char buf, ulg stored_len,
	int eof);
	void zlib_tr_align (deflate_state *s);
	void zlib_tr_stored_block (deflate_state s, char buf, ulg stored_len,
	int eof);
	void zlib_tr_stored_type_only (deflate_state *);


	/* ===========================================================================
	* Output a short LSB first on the stream.
	* IN assertion: there is enough room in pendingBuf.
	*/
	#define put_short(s, w) { \
	put_byte(s, (uch)((w) & 0xff)); \
	put_byte(s, (uch)((ush)(w) >> 8)); \
	}

	/* ===========================================================================
	* Reverse the first len bits of a code, using straightforward code (a faster
	* method would use a table)
	* IN assertion: 1 <= len <= 15
	*/
	static inline unsigned bi_reverse(
	unsigned code, /* the value to invert */
	int len /* its bit length */
	)
	{
	register unsigned res = 0;
	do {
	res \|= code & 1;
	code >>= 1, res <<= 1;
	} while (--len > 0);
	return res >> 1;
	}

	/* ===========================================================================
	* Flush the bit buffer, keeping at most 7 bits in it.
	*/
	static inline void bi_flush(deflate_state *s)
	{
	if (s->bi_valid == 16) {
	put_short(s, s->bi_buf);
	s->bi_buf = 0;
	s->bi_valid = 0;
	} else if (s->bi_valid >= 8) {
	put_byte(s, (Byte)s->bi_buf);
	s->bi_buf >>= 8;
	s->bi_valid -= 8;
	}
	}

	/* ===========================================================================
	* Flush the bit buffer and align the output on a byte boundary
	*/
	static inline void bi_windup(deflate_state *s)
	{
	if (s->bi_valid > 8) {
	put_short(s, s->bi_buf);
	} else if (s->bi_valid > 0) {
	put_byte(s, (Byte)s->bi_buf);
	}
	s->bi_buf = 0;
	s->bi_valid = 0;
	#ifdef DEBUG_ZLIB
	s->bits_sent = (s->bits_sent+7) & ~7;
	#endif
	}

	typedef enum {
	need_more, /* block not completed, need more input or more output */
	block_done, /* block flush performed */
	finish_started, /* finish started, need only more output at next deflate */
	finish_done /* finish done, accept no more input or output */
	} block_state;

	#define Buf_size (8 * 2*sizeof(char))
	/* Number of bits used within bi_buf. (bi_buf might be implemented on
	* more than 16 bits on some systems.)
	*/

	/* ===========================================================================
	* Send a value on a given number of bits.
	* IN assertion: length <= 16 and value fits in length bits.
	*/
	#ifdef DEBUG_ZLIB
	static void send_bits (deflate_state *s, int value, int length);

	static void send_bits(
	deflate_state *s,
	int value, /* value to send */
	int length /* number of bits */
	)
	{
	Tracevv((stderr," l %2d v %4x ", length, value));
	Assert(length > 0 && length <= 15, "invalid length");
	s->bits_sent += (ulg)length;

	/* If not enough room in bi_buf, use (valid) bits from bi_buf and
	* (16 - bi_valid) bits from value, leaving (width - (16-bi_valid))
	* unused bits in value.
	*/
	if (s->bi_valid > (int)Buf_size - length) {
	s->bi_buf \|= (value << s->bi_valid);
	put_short(s, s->bi_buf);
	s->bi_buf = (ush)value >> (Buf_size - s->bi_valid);
	s->bi_valid += length - Buf_size;
	} else {
	s->bi_buf \|= value << s->bi_valid;
	s->bi_valid += length;
	}
	}
	#else /* !DEBUG_ZLIB */

	#define send_bits(s, value, length) \
	{ int len = length;\
	if (s->bi_valid > (int)Buf_size - len) {\
	int val = value;\
	s->bi_buf \|= (val << s->bi_valid);\
	put_short(s, s->bi_buf);\
	s->bi_buf = (ush)val >> (Buf_size - s->bi_valid);\
	s->bi_valid += len - Buf_size;\
	} else {\
	s->bi_buf \|= (value) << s->bi_valid;\
	s->bi_valid += len;\
	}\
	}
	#endif /* DEBUG_ZLIB */

	static inline void zlib_tr_send_bits(
	deflate_state *s,
	int value,
	int length
	)
	{
	send_bits(s, value, length);
	}

	/* =========================================================================
	* Flush as much pending output as possible. All deflate() output goes
	* through this function so some applications may wish to modify it
	* to avoid allocating a large strm->next_out buffer and copying into it.
	* (See also read_buf()).
	*/
	static inline void flush_pending(
	z_streamp strm
	)
	{
	unsigned len;
	deflate_state s = (deflate_state ) strm->state;

	bi_flush(s);
	len = s->pending;
	if (len > strm->avail_out) len = strm->avail_out;
	if (len == 0) return;

	if (strm->next_out != NULL) {
	memcpy(strm->next_out, s->pending_out, len);
	strm->next_out += len;
	}
	s->pending_out += len;
	strm->total_out += len;
	strm->avail_out -= len;
	s->pending -= len;
	if (s->pending == 0) {
	s->pending_out = s->pending_buf;
	}
	}
	#endif /* DEFUTIL_H */